<script lang="ts" setup name="GoodsImage">
import { ref, onBeforeUnmount, computed } from "vue"
import { useMouseInElement } from '@vueuse/core'
// 接收父组件数据
defineProps<{
  images: string[]
}>()
let active = ref(0)
let timer = -1
const play = () => {
  timer = window.setInterval(() => {
    active.value++
    if (active.value === 5) {
      active.value = 0
    }
  }, 2000)
}
const stop = () => {
  clearInterval(timer)
}
onBeforeUnmount(() => {
  stop()
})
// 放大镜效果-控制显示隐藏 
const target = ref(null)
const { elementX, elementY, isOutside } = useMouseInElement(target)
const position = computed(() => {
  let x = elementX.value - 100;
  let y = elementY.value - 100;
  // 临界值
  if (x <= 0) x = 0
  if (x >= 200) x = 200
  if (y <= 0) y = 0
  if (y >= 200) y = 200
  return {
    x, y
  }
})
</script>
<template>
  <div class="goods-image" @mouseenter="stop" @mouseleave="play">
    <!-- 大图片容器 -->
    <div class="large"
      :style="[{ backgroundImage: `url(${images[active]})` }, { backgroundPosition: `${-position.x * 2}px ${-position.y * 2}px` }]"
      v-show="!isOutside"></div>
    <div class="middle">
      <!-- 商品图片 -->
      <img :src="images[active]" alt="" ref="target" />
      <!-- 移动的遮罩层 -->
      <div class="layer" v-show="!isOutside" :style="{ left: position.x + 'px', top: position.y + 'px' }"></div>
    </div>
    <ul class="small">
      <li v-for="(item, index) in images" :key="item" :class="{ active: active === index }"
        @mouseenter="active = index">
        <img :src="item" alt="" />
      </li>
    </ul>
  </div>
</template>

<style scoped lang="less">
.goods-image {
  width: 480px;
  height: 400px;
  position: relative;
  display: flex;
  z-index: 500;

  .large {
    position: absolute;
    top: 0;
    left: 412px;
    width: 400px;
    height: 400px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    background-repeat: no-repeat;
    background-size: 800px 800px;
    background-color: #f8f8f8;
  }

  .middle {
    width: 400px;
    height: 400px;
    background: #f5f5f5;
    position: relative;
    cursor: move;

    .layer {
      width: 200px;
      height: 200px;
      background: rgba(0, 0, 0, .2);
      left: 0;
      top: 0;
      position: absolute;
    }
  }

  .small {
    width: 80px;

    li {
      width: 68px;
      height: 68px;
      margin-left: 12px;
      margin-bottom: 15px;
      cursor: pointer;

      &:hover,
      &.active {
        border: 2px solid @xtxColor;
      }
    }
  }
}
</style>
